65825078205681 has 48 divisors (see below), whose sum is σ = 101081505096000. Its totient is φ = 41159811139200.

The previous prime is 65825078205659. The next prime is 65825078205697. The reversal of 65825078205681 is 18650287052856.

It is a happy number.

65825078205681 is a `hidden beast` number, since 6 + 58 + 2 + 507 + 8 + 20 + 56 + 8 + 1 = 666.

It is not a de Polignac number, because 65825078205681 - 2⁹ = 65825078205169 is a prime.

It is a super-2 number, since 2×65825078205681² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65825078205281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 340297450 + ... + 340490828.

It is an arithmetic number, because the mean of its divisors is an integer number (2105864689500).

Almost surely, 2^{65825078205681} is an apocalyptic number.

It is an amenable number.

65825078205681 is a deficient number, since it is larger than the sum of its proper divisors (35256426890319).

65825078205681 is a wasteful number, since it uses less digits than its factorization.

65825078205681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213214 (or 213211 counting only the distinct ones).

The product of its (nonzero) digits is 64512000, while the sum is 63.

The spelling of 65825078205681 in words is "sixty-five trillion, eight hundred twenty-five billion, seventy-eight million, two hundred five thousand, six hundred eighty-one".